"Which would you rather have in the view from your
house? A thing about the size of a domestic garage, or eight towers
twice the height of Nelson’s column with blades noisily thrumming the
air. The energy they can produce over ten years is similar: eight wind
turbines of 2.5-megawatts (working at roughly 25% capacity) roughly
equal the output of an average Pennsylvania shale gas well (converted
to electricity at 50% efficiency) in its first ten years. " Matt Ridley writes in The Spectator.